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A new CDC study found 5% of infants or fetuses born to women in the U.S. with laboratory-confirmed Zika infections had microcephaly or another Zika-linked birth defect.

"The bottom line is that Zika infection, identified during any trimester of pregnancy, can lead to serious brain and other birth defects," said Peggy Honein, an author on the study.

What they found: Infants developed microcephaly and other birth defects regardless of whether or not the mother displayed symptoms. The data also showed that babies infected in all trimesters exhibited birth defects, but the earlier the infection occurred, the more likely they were. Rates ranged from 8% for infants infected in the first trimester to 4% in the third.

Unanswered questions: There are reported cases of Zika-infected mothers having babies that appear normal at birth, but develop microcephaly and neurological difficulties as they age. Because this study looked at newborns, these cases are not included.

Go deeper: Much of the research linking Zika to microcephaly has been done in South America. This study confirms that those cases were due to the Zika virus, and not due to an interaction of the virus with something genetic or environmental in the area. The size (2549 people) and rigor of the study was also important, as past research on Zika-related birth defects has ranged in quality and given prevalence rates ranging from 1-13%. This was one of the first studies to break down infections by trimester and whether or not the mother was asymptomatic.

Go deeper

Capitol review panel recommends more police, mobile fencing

Photo: Olivier Douliery/AFP via Getty Images

A panel appointed by Congress to review security measures at the Capitol is recommending several changes, including mobile fencing and a bigger Capitol police force, to safeguard the area after a riotous mob breached the building on Jan 6.

Why it matters: Law enforcement officials have warned there could be new plots to attack the area and target lawmakers, including during a speech President Biden is expected to give to a joint session of Congress.

Financial fallout from the Texas deep freeze

Illustration: Annelise Capossela/Axios

Texas has thawed out after an Arctic freeze last month threw the state into a power crisis. But the financial turmoil from power grid shock is just starting to take shape.

Why it matters: In total, electricity companies are billions of dollars short on the post-storm payments they now owe to the state's grid operator. There's no clear path for how they will pay — something being watched closely across the country as extreme weather events become more common.

U.S. Chamber decides against political ban for Capitol insurrection

A pedestrian passes the U.S. Chamber of Commerce headquarters as it undergoes renovation. Photo: Andrew Harrer/Bloomberg via Getty Images

The U.S. Chamber of Commerce revealed Friday it won't withhold political donations from lawmakers who simply voted against certifying the presidential election results and instead decide on a case-by-case basis.

Why it matters: The Chamber is the marquee entity representing businesses and their interests in Washington. Its memo, obtained exclusively by Axios, could set the tone for businesses debating how to handle their candidate and PAC spending following the Jan. 6 Capitol attack.